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This is not a write up - more of an FYI for people searching in the future. I read countless threads on the topic and couldn't find this. The Advance Adapters 300475 bolts right in to the front of the 247 t-case, and should bolt into the 242 as well. It even has the spline relief at the front as seen in the pictures. $36.41 at Jegs at time of posting, mated with a used ZJ v8 driveshaft, made it the most budget friendly that I have seen.
Edit: you will also need to source bolts from the yoke to the driveshaft.
Yes I know i need to go back and add a seal guard.